24 results about "Vanadium redox battery" patented technology

The invention belongs to the field of all-vanadium redox flow batteries, and particularly discloses a bismuth alkene nanosheet modified defect-rich graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the bismuth alkene nanosheet modified defect-rich graphite felt electrode for the all-vanadium redox flow battery. The preparation method comprises the following steps: dissolving zinc nitrate (Zn (NO3) 2) in a solvent to prepare a saturated solution, soaking TGF in the saturated solution, drying, and calcining in a nitrogen atmosphere to prepare porous graphite felt (CGF) of which the surface is rich in carbon defects; the preparation method comprises the following steps: dissolving bismuth chloride (BiCl3) in a prefabricated electrolyte (containing V2 (SO4) 3 and H2SO4 solution with a certain concentration), and depositing on the surface of the CGF by adopting a constant current density electrodeposition method to form a few layers of bismuthene nanosheets, so as to prepare the BieneNF-CGF electrode. The prepared electrode shows excellent electrochemical activity and interface stability, the electrode reaction kinetics and the overall performance of the battery can be remarkably improved, high-rate, high-energy-efficiency and long-cycle-life all-vanadium redox flow battery application is achieved, and good industrial application prospects are achieved.

The invention discloses a manufacturing method of a vanadium redox battery in the technical field of vanadium redox batteries, which comprises the following steps: S1, adding phosphoric acid (H3PO4) and citric acid (molar ratio of 1: (2-4)) into a positive electrolyte, and irradiating the negative electrolyte for 60-80 minutes by adopting ultraviolet light (intensity of 50-60 mW / cm < 2 >); s2, the electrode is a gradient electrode, the surface layer is a Bi (at) MnO2 heterojunction catalyst layer, and the thickness is 50 + / -5 nm; the middle layer is a vertically arranged graphene array, and the interlayer spacing is 2-5nm; the bottom layer is a graphene aerogel diversion layer, the porosity is 90%, and the aperture is 10-50 microns; the electrode is subjected to argon plasma treatment for 10-20 minutes, and pulse electrochemical oxidation is synchronously applied; s3, a flow channel of the bipolar plate is of a three-stage fractal tree-shaped structure, the width of a main channel is 2-3 mm, the branch proportionality coefficient is 0.7-0.8, the branch angle is 45-50 degrees, and the surface of the flow channel is coated with a SiO2 / PTFE super-hydrophobic coating. And long-acting stability and high-purity regulation and control of the electrolyte are realized through phosphoric acid-citric acid synergistic complexing and photochemical reduction coupling.

The invention relates to a skid-mounted electrolyte production method, which adopts a combined container structure of a production container and a quality inspection container, takes pure V2O5 with the purity of more than or equal to 99.5% as a raw material, and adopts an integrated coherent process to produce an all-vanadium redox flow battery electrolyte. The invention mainly aims to provide a skid-mounted electrolyte production method, and provides an electrolyte production method which is portable, integrated, efficient, coherent, excellent in performance, flexible, adaptive, environment-friendly and safe, so that large-scale application of an all-vanadium redox flow battery in the field of energy storage is promoted.

The utility model discloses a vanadium redox battery liquid storage tank and a vanadium redox flow battery, the vanadium redox battery liquid storage tank comprises a tank body, a top liquid pipe and a bottom liquid pipe, the tank body is a vertically arranged column, and the inner side wall of the tank body is a smooth cambered surface; the liquid jacking pipe is arranged on the side wall of the upper part of the tank body, and the inner end of the liquid jacking pipe is communicated with the tank body and is tangent to the arc surface of the inner side wall of the tank body; the bottom liquid pipe is arranged on the side wall of the lower portion of the tank body, the inner end of the bottom liquid pipe is communicated with the tank body and tangent to the arc face of the inner side wall of the tank body, and the lowest position of the inner end of the bottom liquid pipe is flush with the inner bottom wall of the tank body. The problem that turbulence and a dead zone are prone to being generated in an existing vanadium battery tank can be solved, the resistance of vanadium battery electrolyte entering and exiting the tank is reduced, and the energy consumption level of a pump is further reduced. And meanwhile, all the electrolyte participates in the oxidation-reduction reaction in the galvanic pile, so that the vanadium ion utilization rate of the all-vanadium redox flow battery is further improved.

The utility model provides a container top structure and a vanadium redox flow battery container, and relates to the technical field of all-vanadium redox flow battery, the container top structure comprises first main beams, second main beams, at least two long beams and at least two short beams, the long beams are arranged between the pair of first main beams, two ends of the long beams are respectively connected with the second main beams, and the short beams are respectively connected with the second main beams. The short beam is arranged between the pair of second main beams, and the two ends of the short beam are connected with the first main beams respectively; the long beams and the short beams divide the first main beam and the second main beam into a plurality of grids, and a cover plate is arranged in each grid. According to the top cover of the container, the crossed net rack is arranged on the top of the container, and then the small cover plates are compactly arranged on the top of the container to form the top cover of the container; as each cover plate can be independently detached, the operation is convenient and fast, and installation during integration of internal systems of the container and later overhaul and maintenance when local problems occur are facilitated.

The application discloses a kind of all-vanadium redox battery electrolyte capacity recovery method, device and application, belong to the technical field of flow battery electrolyte.The all-vanadium redox battery electrolyte capacity recovery method provided by the application comprises: introducing the positive electrolyte and negative electrolyte of the all-vanadium redox battery to be recovered into an electrolysis stack for electrolysis, so that the positive electrolyte and negative electrolyte are electrolyzed;The positive electrolyte after electrolysis is introduced into the positive electrode chamber in the reduction reaction tank, and the reducing solution is introduced into the solution chamber in the reduction reaction tank, and the potential difference between the positive electrolyte and the reducing solution is used to carry out redox reaction;The positive electrolyte in the positive electrode chamber after electrolysis is introduced into the positive electrolyte storage tank of the all-vanadium redox battery, and the negative electrolyte after electrolysis is introduced into the negative electrolyte storage tank of the all-vanadium redox battery, thereby completing the capacity recovery of the all-vanadium redox battery, and has wide application prospect in the field of all-vanadium redox battery.

The invention belongs to the technical field of battery materials, and particularly discloses a pretreatment process of PAN-based carbon fibers and application of the PAN-based carbon fibers in preparation of a high-activity flow battery electrode material. The method comprises the following steps: soaking a polyacrylonitrile (PAN) precursor in an aqueous solution containing a pretreating agent such as potassium dichromate, and carrying out chemical pretreatment, so that the surface of the PAN fiber is subjected to primary structural transformation; and respectively carrying out pre-oxidation and carbonization treatment on the obtained material to obtain the PAN-based carbon fiber electrode material with the catalyst on the surface. When the obtained carbon fiber material is used as an electrode material of the all-vanadium redox flow battery, the electrode reaction kinetics of the positive electrode and the negative electrode of the battery can be effectively improved, and the energy conversion efficiency and the rate capability of the battery are improved. The method is easy to operate, compared with a traditional electrode preparation technology, energy consumption is low, the process is simple, large-scale production is easy to achieve, and the method has good application prospects in the field of vanadium battery electrode materials.

The invention discloses an on-site installation and replacement device for an all-vanadium redox flow battery electric pile, and relates to the technical field of all-vanadium redox flow battery equipment assistance. A lifting mechanism for driving an all-vanadium redox flow battery stack to lift is arranged on the outer surface of one side of the integral frame, the lifting mechanism comprises a movable support and a driving assembly, and a lifting table is slidably connected to the interior of the integral frame; according to the on-site installation and replacement device for the all-vanadium redox flow battery stack, the overall frame is arranged to be matched with the universal wheels and the ground feet, carrying and replacement in various indoor and outdoor complex environments can be achieved, the flexibility of the device is guaranteed, meanwhile, the lifting motor and the electric conveying motor are electrically driven to complete lifting and conveying actions in the whole process, manual carrying participation is reduced, and the working efficiency is improved. And the operation labor intensity of hundreds of kilograms of galvanic piles is reduced.

The invention relates to the technical field of battery management systems, discloses an all-vanadium redox flow battery state-of-charge prediction method based on hierarchical physical prior strengthening, and aims to realize accurate prediction of the battery state-of-charge. The method comprises the following steps: collecting an endogenous time sequence and an exogenous time sequence of all-vanadium redox flow battery operation; respectively performing embedding processing on the endogenous time sequence and the exogenous time sequence to obtain an endogenous feature marker and an exogenous feature marker; wherein the endogenous time sequence is a charge state sequence, and the exogenous time sequence comprises current, terminal voltage, open-circuit voltage and temperature. And sequentially carrying out local time sequence feature extraction, physical memory state tracking, electrochemical dynamic state correction, endogenous and endogenous feature fusion and thermodynamic constraint enhancement processing on the endogenous feature mark and the exogenous feature mark, and outputting a feature vector after physical consistency enhancement. And performing constraint adjustment on the feature vector after physical consistency enhancement based on the law of conservation of charge, and outputting a final state of charge prediction result.

The invention provides an all-vanadium redox flow battery pump fault detection method based on a self-adaptive GCN, and the method comprises the following steps: carrying out the operation experiment of an all-vanadium redox flow battery in a plurality of operation states, collecting a battery voltage signal and an electrolyte flow signal in the experiment process, and marking the corresponding battery state as a training set; performing feature extraction and feature fusion on the battery voltage signal and the electrolyte flow signal to obtain a multi-modal node feature matrix of the all-vanadium redox flow battery; the Euclidean distance between the nodes is calculated to serve as the similarity between the nodes, a similarity matrix is constructed, neighbors with the highest similarity are screened out for each node from the similarity matrix, and an adjacent matrix is constructed; constructing a graph convolutional neural network model based on the adjacent matrix, and introducing an adaptive smoothing factor used for dynamically adjusting the smoothing strength of neighborhood features during volume accumulation; and inputting to-be-detected battery operation data into the trained graph convolutional neural network model to obtain a battery pump fault diagnosis result.

The invention discloses an all-vanadium redox flow battery cable fixing device, which comprises a horizontally arranged bottom plate, two vertical rods fixedly arranged at two ends of the top surface of the bottom plate, a plurality of mounting plates arranged along the length direction of the bottom plate, a plurality of groups of clamping mechanisms and a driving mechanism, the mounting plates are fixedly arranged between the two vertical rods respectively and are uniformly arranged at intervals along the height of the vertical rods, the clamping mechanisms are uniformly arranged on the mounting plates at intervals, and the driving mechanism provides power for the clamping mechanisms. The technical problems that cable replacement is tedious and the working efficiency is affected are solved.

The utility model discloses a kind of all-vanadium redox battery systems, including capacity tank and power box, further including transport and distribution tank, capacity tank is provided with first battery management unit, transport and distribution tank is provided with second battery management unit, the outer wall of power box is provided with BMS special cabin and confluence control cabinet, BMS special cabin is provided with BMS main controller, BMS main controller is connected with first battery management unit, second battery management unit and confluence control cabinet respectively. By separately setting BMS special cabin and confluence control cabinet outside power box, it is greatly convenient for the operation and maintenance management work of later period, frequent access to power box when operation and maintenance can be avoided. And by setting transport and distribution tank, most of electrolyte supply line structure and heat exchanger and cooling liquid circulation pipeline are separated from power box, reduce the occupation to power box internal installation space and simplify power box internal structure composition, it is convenient for operation and maintenance management, and using above structure also facilitate the modularization construction of liquid flow battery system, it is convenient for quick expansion.

The utility model provides a kind of all-vanadium redox battery installation connecting assembly, belong to all-vanadium redox battery installation technical field. Including liquid inlet pipe and first pipeline, the inside of first pipeline is equipped with dismounting mechanism;Dismounting mechanism includes second pipeline, second pipeline is connected in the middle portion of first pipeline, the outside of second pipeline is equipped with fixed plate, the below of second pipeline is equipped with support plate, support plate is connected between fixed plate by bolt assembly, the inside of second pipeline is equipped with filter screen, the below of filter screen is equipped with two sliding blocks, the surface sliding connection of two sliding blocks has moving box, the below of two sliding blocks is respectively with the inner wall between two moving boxes It is equipped with spring. Advantage lies in: by using dismounting mechanism, the purpose of dismounting replacement or cleaning to filter screen can be achieved, so that filter screen can be disassembled and replaced when damaged, so that the filtering effect of filter screen on battery liquid is better, avoid battery liquid to block pipeline.

The application discloses a kind of based on adaptive observer's all-vanadium redox battery state of charge estimation method, comprising: for all-vanadium redox battery system, establish the equivalent circuit model of all-vanadium redox battery based on 1 order RC network;The equivalent circuit model of all-vanadium redox battery based on 1 order RC network is rewritten as state space equation form, obtain the changed equivalent circuit model of all-vanadium redox battery;For the changed equivalent circuit model of all-vanadium redox battery, introduce high gain and auxiliary variable, establish the second adaptive observer, and then according to the second adaptive observer designed to realize the estimation of the voltage to be observed in system and model parameter;According to the voltage value estimated, realize the estimation of all-vanadium redox battery state of charge.The application provides a new idea for the online, accurate estimation of all-vanadium redox battery state of charge, and compared with traditional estimation method, can significantly improve estimation accuracy.

The invention discloses an all-vanadium redox flow battery sealing device which comprises a box body, the top of the box body is covered with a sealing cover, a first sealing strip is arranged between the outer side wall of the box body and the inner side wall of the sealing cover, a second sealing strip is arranged between the top wall of the box body and the inner top wall of the sealing cover, and the box body and the sealing cover are tightly connected through a plurality of fastening assemblies. The multiple fastening assemblies are evenly distributed in the circumferential direction of the box body. According to the fastening assembly, the all-vanadium redox flow battery sealing device can be quickly disassembled and assembled, tools are not needed, the operation is convenient, and time and labor are saved; the double sealing structures arranged on the side surfaces and the top surface ensure the sealing reliability, effectively solve the defects of traditional bolt connection, and improve the operation and maintenance efficiency and stability of the all-vanadium redox flow battery.

The invention discloses a carbon nanosheet coated carbon fiber composite electrode material, a preparation method thereof and application of the carbon nanosheet coated carbon fiber composite electrode material in an all-vanadium redox flow battery. The preparation method comprises the following steps: soaking a polyacrylonitrile original felt in a rhodanine aqueous solution containing sodium chloride, so that rhodanine and sodium chloride are fully loaded on the surface of original felt fiber; carrying out freeze drying, putting into a tubular furnace, and carrying out high-temperature carbonization; in a high-temperature environment, rhodanine and polyacrylonitrile original felt are pyrolyzed to generate gas and a carbon source, and sodium chloride is melted, so that rich nano bubbles can be generated on the surface of the polyacrylonitrile original felt, and two-dimensional carbon nanosheets grow in situ around the bubbles due to pyrolysis and rearrangement of the carbon source and wrap the surfaces of carbon fibers; therefore, the composite electrode material with the carbon nanosheets coated with the carbon fibers can be obtained. The obtained composite carbon fiber material is used as an electrode material of an all-vanadium redox flow battery, the effective active area of an electrode can be effectively increased, the electrode reaction process dynamics is accelerated, and the energy conversion efficiency of the battery is improved.

The invention belongs to the technical field of preparation of energy membranes, and discloses a preparation method and application of a covalent organic framework in-situ modified homogeneous vanadium battery conducting membrane, sulfonated polybenzimidazole (SPBI) is used as a supramolecular template, and through directional interaction between a sulfonic acid group and an amino monomer of the supramolecular template, under the catalysis of trifluoromethanesulfonic acid, the covalent organic framework in-situ modified homogeneous vanadium battery conducting membrane is prepared. An aldehyde group monomer is guided to generate an in-situ Schiff base reaction, so that uniform growth of high-crystallinity COF in a polymer matrix is realized, and a conducting membrane with a regular ion screening channel is formed. The preparation process is simple, mild in condition and easy to amplify. The obtained SPBI (at) COF conducting membrane has high proton conductivity (more than 0.1 S / cm at 80 DEG C) and excellent vanadium resistance, can realize high capacity retention rate of 2000 cycles in an all-vanadium redox flow battery, and is suitable for a large-scale energy storage system.

The application relates to a kind of marine all-vanadium redox battery system mounting devices, and the marine all-vanadium redox battery system mounting device includes: mounting frame, electrolyte storage tank and hydraulic cylinder;Mounting frame includes the mounting bottom plate arranged on the ship, and the hemispherical groove is arranged on the mounting bottom plate;The first end of electrolyte storage tank is arranged in the hemispherical groove, and the first end of electrolyte storage tank is matched with the shape of hemispherical groove, and electrolyte storage tank can swing in the hemispherical groove;The outer wall of electrolyte storage tank is also fixedly provided with adjusting plate, and the adjusting plate is arranged close to the first end of electrolyte storage tank;Hydraulic cylinder is arranged on the mounting bottom plate, and hydraulic cylinder is located between mounting bottom plate and adjusting plate, and hydraulic cylinder is used to adjust the attitude of electrolyte storage tank.The application utilizes the expansion and contraction of piston rod in hydraulic cylinder to drive electrolyte storage tank to swing, when the ship is tilted on the mounting bottom plate due to wind and wave during sailing, the piston rod in the hydraulic cylinder on the tilted side is extended, and the angle of electrolyte storage tank is actively adjusted.

The invention discloses a composite foundation of an all-vanadium redox flow battery system, and relates to the technical field of energy storage system foundation construction. The composite foundation of the all-vanadium redox flow battery system comprises a foundation bottom plate and a foundation side plate, wherein the foundation side plate is connected with the periphery of the foundation bottom plate and extends upwards; wherein the foundation bottom plate and the foundation side plates jointly define a liquid storage tank with an open top; the top of the liquid storage tank is used for supporting the all-vanadium redox flow battery system, and the internal space of the liquid storage tank is used for collecting and storing leaked electrolyte when the electrolyte leaks. The composite foundation of the all-vanadium redox flow battery system provided by the invention is beneficial to improving the safety of the all-vanadium redox flow battery system.

The application discloses a three-closed-loop charging and discharging control method based on a full-vanadium redox battery core voltage estimation, which comprises first, second and third closed-loop control links; in the first closed-loop control link, whether a charging process or a discharging process is judged based on SOC; when the charging process is adopted, a reference current and a core voltage setting value are output to the second closed-loop control link; in the second closed-loop control link, the reference current and the core voltage setting value are obtained, and the charging and discharging current of the full-vanadium redox battery and the core voltage of the full-vanadium redox battery are obtained, and then the adjusted reference current is obtained through voltage proportional integral adjustment and output to the third closed-loop control link; in the third closed-loop control link, the sum is calculated by combining the components of the alternating current on the d-axis and the q-axis and the components of the three-phase power grid voltage on the d-axis and the q-axis; the control voltage of the thyristor is obtained by the PQ control module based on the sum, and then the space vector modulation is performed.

The utility model discloses a kind of all-vanadium redox battery stack internal leakage detection devices, including nitrogen gas supply module that nitrogen gas is imported to the positive pole cavity and negative pole cavity of stack, liquid supply module that deionized water is transported to stack positive pole cavity, gas supply module that dry HCl gas is transported to stack negative pole cavity, monitoring module that detects the pressure change in negative pole cavity, safety processing module that gas is discharged in negative pole cavity is handled;The utility model simple structure, convenient operation can be adapted to different specifications all-vanadium redox battery stack, simultaneously meet production batch quality inspection and on-site operation and maintenance diagnosis demand;By transporting deionized water to stack positive pole cavity, dry HCl gas is transported to stack negative pole cavity, so that stack positive pole cavity and negative pole cavity form gas-liquid pressure difference, then based on gas-liquid pressure difference design and HCl gas dissolution amplification effect, the trace water volume change generated by tiny leakage is converted into the significant pressure drop of negative pole cavity, realize 0.1mL / min level tiny internal leakage accurate, fast detection.

The application discloses a kind of all-vanadium redox battery electrolyte and its preparation method and application, belong to the technical field of preparation of flow battery.The all-vanadium redox battery electrolyte includes positive electrolyte and negative electrolyte, the positive electrolyte includes the following raw materials: vanadyl sulfate, vanadium pentoxide, sulfuric acid, organic phosphoric acid stabilizer and carbon nanotube;The negative electrolyte includes the following raw materials: vanadium trichloride, vanadium dichloride, sulfuric acid, organic phosphoric acid stabilizer and carbon nanotube.The preparation method includes raw material preparation, dissolving mixing, adding stabilizer and carbon nanotube and adjusting pH value and the like steps.The electrolyte prepared by the application can effectively inhibit precipitation crystallization, reduce battery internal resistance, improve energy conversion efficiency, prolong battery service life and promote commercial application of all-vanadium redox battery.

The application relates to the field of batteries. The application provides a method for adjusting the comprehensive valence state of electrolyte of a full vanadium redox flow battery. The method comprises circulating the positive and negative electrolyte without passing through an electric pile until the concentrations of the positive and negative electrolyte are uniform; calculating the volume Vp of the positive electrolyte and the volume Vn of the negative electrolyte, determining that Vp / Vn is k, and k is a positive rational number; mixing a positive electrolyte sample drawn from a positive electrolyte storage tank and a negative electrolyte sample drawn from a negative electrolyte storage tank according to a volume ratio of k:1 to obtain a mixed electrolyte sample; measuring the concentration of protons in the mixed electrolyte sample; measuring the open-circuit voltage of a test single cell; calculating the comprehensive valence state of the mixed electrolyte sample; and adding a reducing agent or an oxidizing agent to adjust the comprehensive valence state of the mixed electrolyte sample if the comprehensive valence state of the mixed electrolyte sample is greater than or less than 3.5. The method can quickly sample and analyze the deviation of the valence state of the electrolyte and quickly adjust the valence state.

1. Name of the design product: all-vanadium redox battery stack. 2. Use of the design product: the design product is used as a power unit for converting chemical energy into electrical energy. 3. Design points of the design product: in the combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.